Dynamics and quantum entanglement of two-level atoms in de Sitter spacetime

摘要: In the framework of open quantum systems, we study internal dynamics both freely falling and static two-level atoms interacting with quantized conformally coupled massless scalar field in de Sitter spacetime. We find that atomic transition rates depend on nature spacetime motion atoms, interestingly steady states for cases are always driven to being purely thermal, regardless initial states. This thermalization phenomenon is structurally similar what happens an elementary system immersed a thermal field, thus reveals Besides, baths will drive entanglement shared by atom (the atom) its auxiliary partner, same which isolated from external fields, sudden death, proper time be extinguished computed. also analyze such disentanglement phenomena, principle, could understood perspective table-top simulation experiment.